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用透射电镜小角度会聚束产生的明税Kikuchi线测量了大晶粒LC9超硬铝合金在高温慢速热扭转过程中的晶内亚晶界角变化，发现亚晶界角随变形量的增加逐步增加，表明连续动态再结晶是该材料在高温慢速预变形中晶粒细化的主要机制，双态分布的析出相在连续动态再结晶中所起的作用与其在常规的热机械加工过程中所起作用有所不同，弥散分布的小沉淀相阻碍位错的滑移和攀移并钉扎晶界与亚晶界，而大析出颗粒在此起不到有效地产生再结晶核心的作用
The tax Kikuchi line produced by the small angle convergent beam of the transmission electron microscope was used to measure the intragranular subgrain boundary angle of the large grain LC9 superhard aluminum alloy under the condition of high temperature and slow thermal torsion. It was found that the subgrain boundary angle increased with the deformation The results show that the continuous dynamic recrystallization is the main mechanism of grain refinement during the slow pre-deformation at high temperature. The role of precipitated phase with bimodal distribution in continuous dynamic recrystallization is similar to that of conventional dynamic recrystallization. Has a different role, the dispersed small sediment phase hinders dislocation slip and climbing and pinning grain boundaries and subgrain boundaries, and large precipitated particles in this can not effectively produce the role of recrystallization core